In an ominous warning Mr Johnson wrote: “In the meantime the experience of Greece alone is a lesson in the absolute insanity of any country allowing itself to be bullied by EU negotiators.”

He said Greece’s economic troubles has “direct read-across for Britain” and taking a fresh pop at Mrs May’s plans he wrote: “Under the Chequers proposals, we are about to make a historic mistake and turn this country into a rules-taker from Brussels, with no say on those rules – not just for industrial goods and agri-foods but across a wide range of economic activity.

The ex-Foreign Sec's call for a clean break from the EU marks a fresh attack on Theresa May

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“Look at the humiliation of Greece – an EU member – and ask yourself how the EU will legislate with the UK out of the room, and when we can no longer do anything to protect ourselves from the imposition of those rules.

“Will the EU act in our interests and the interests of UK jobs and growth, or the interests of the EU?

“The answer is clear. It is written in graffiti all over Greece. Why, then, are we proposing to turn the UK, in important respects, into the perpetual punk of Brussels? Chuck Chequers.”